Molybdenum-titanium-cobalt alloy



i 2,884,324 Unlted States Patent ice ranging from .012% to .029%, titanium sponge having an oxygen content below .2%, cobalt (vacuum melted 2,884,324 99.9% pure cobalt).

MOLYBDENUM TITANIUM COBALT ALLOY Specific examples of the composition of the new alloys 5 include the following: George A. Timmons, Ferndale, and Marion Semchyshen,

Dearborn, Mich., assignors to American Metal Climax, A B 0 Inc., a corporation of New York No Drawing. Application December 6, 1955 Percent Percent Percent 18 22 Serial No. 551,228 .11 I01 .05

.03 .02 .025 1 Claim. (Cl. 75-176) Oxyge .0015 .001 .001

Molybdenum balance balance balance The present invention relates to cast molybdenum-base 15 Alloy A above was found to have a tensile strength alloys of 94,100 pounds per square inch at 1600 F. in vacuum. The object of the invention is to provide a molybdenumi 9 whlch g than that Of any kngwn mabase alloy casting capable of being worked at elevated 'tenal mdlcates that alloy may be used to a vantage where exceptional strength is required at 1600 F. for g ggfig zfig fi g hlgh strength at temperatures m 20 a short time. The same alloy has a 100 hour creeprupture strength of 67,000 pounds per square inch at 1600 F., but its strength drops ofi rapidly on increases in temperature with the result that it is inferior to some other known molybdenum-base alloys in creep-rupture properties at 1800 F. and higher.

What is claimed is:

A cast molybdenum-base alloy capable of being worked at elevated temperatures and containing from .10% to 22% titanium, from .05% to .15 cobalt, not more than .005% oxygen, not more than .04% carbon, and the balance consisting essentially of molybdenum.

The alloys of the present invention contain from .10% to .22% titanium, from .05% to .15% cobalt, unavoidable amounts of oxygen not exceeding .005%, small amounts of residual carbon, and the balance molybdenum, except for minute and unavoidable quantities of impuri- 25 ties. The alloys are prepared by are melting in vacuum, preferably using a furnace of the type disclosed in United States Patent No. 2,656,743. Carbon is added to react with any oxygen present in the raw materials and to leave a slight excess in the final casting. The best results are obtained when the carbon content is less than .04%. The absolute pressure during the melting operation is prefer- References cited in the file of this patent ably maintained below 50 microns of mercury.

The raw materials used in making the new alloy con- UNITED STATES PATENTS sisted of moylbdenum powder having an oxygen content 2,678,269 Ham et al. May 11, 1954 

